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Roller coaster physics conceptual question

  1. Dec 15, 2016 #1
    1. The problem statement, all variables and given/known data
    For my high school physics class we made roller coasters out of card stock with various loops and funnels. We then had multiple questions to answer. I couldn't seem to figure this one out.

    Why does the power have to be found at the bottom of the loop? Explain in terms of both energy and velocity.

    2. Relevant equations
    Power=Work/time
    Work=Force*Distance or the change in kinetic energy
    Force=Mass*Acceleration

    3. The attempt at a solution
    I figured that the conversion from kinetic energy (at the bottom of the loop) to potential energy (at the top of the loop) could have an affect on the power. But I was not sure about how velocity played a part. I also know that gravity is constantly pulling down on the marble and force normal is keep it on the track, but like before I didn't know how to incorporate it.
     
  2. jcsd
  3. Dec 15, 2016 #2

    CWatters

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    Science Advisor
    Homework Helper

    I think we need to see earlier parts of the question to understand the context.
     
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